Consider the chemical equilibrium, Time left 0:44:30 Fe³+(aq) SCNT (aq) FeSCN² +(aq) The equilibrium concentration of [FeSCN2 +] for this reaction can be determined using a spectrophotometer and is related to the absorbance, A, by the expression: A = el[FeSCN² +1₂ where € = 3300 M cm is the molar absorptivity constant and / = 1 cm is the spectrophotometer cell path length. A solution was made up by mixing 25.0 cm³ of 2.0 x 103 M Fe(NO₂), (aq) with 25.0 cm³ of 2.0 x 103 M KSCN(aq) at 25°. The measured absorbance at equilibrium was 0.225. The initial concentration (at the instant of mixing) of [Fe³+] is Select one: O a. 2.0 x 10¹ M O b. 5.0 x 10-5 M O c. 2.0 x 10-³ M O d. 0.225 M O e. 1.0 x 10³ M 12

Consider the chemical equilibrium, Time left 0:44:30 Fe³+(aq) SCNT (aq) FeSCN² +(aq) The equilibrium concentration of [FeSCN2 +] for this reaction can be determined using a spectrophotometer and is related to the absorbance, A, by the expression: A = el[FeSCN² +1₂ where € = 3300 M cm is the molar absorptivity constant and / = 1 cm is the spectrophotometer cell path length. A solution was made up by mixing 25.0 cm³ of 2.0 x 103 M Fe(NO₂), (aq) with 25.0 cm³ of 2.0 x 103 M KSCN(aq) at 25°. The measured absorbance at equilibrium was 0.225. The initial concentration (at the instant of mixing) of [Fe³+] is Select one: O a. 2.0 x 10¹ M O b. 5.0 x 10-5 M O c. 2.0 x 10-³ M O d. 0.225 M O e. 1.0 x 10³ M 12

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.91PAE

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